For 2015, the city is in fact using a traditional flat budgeted
amount. What’s more, officials with Mayor Mitch Landrieu’s office and
the Sheriff’s Office confirmed, the city already stopped using the per
diem formula this year.

“It happened,” Guidry told The Lens Monday. “The 2014 budget was the first one for the sheriff that was not per diem.”

Yay? Well maybe not. At the moment, all this means is that we no longer have any idea how the Sheriff's budget will be determined. The new thing could still be a "perverse an incentive" as ever to put people in jail. We just don't know what the formula is yet.